Table 2.
Demographics and Smoking History of Subjects by Study
| e-Cigarettes | Cigarette smokers | |||
|---|---|---|---|---|
| e-Cigarette users, N = 28 | Carmella et al. 15 (N = 17) | Hatsukami et al. 17 (N = 165) | Zarth et al. 14 (N = 40) | |
| Age (years) | 34.0±12.7 | 43.3±10.8 | 41.3±13.2 | 34.4±9.5 |
| Female | 42.9% | 64.7% | 47.3% | 57.5% |
| Non-Hispanic Whites | 92.6% | 88.2% | 85.9% | – |
| Education | ||||
| Some high school | 0.0% | 5.9% | 4.3% | – |
| High school graduate | 11.1% | 17.7% | 24.5% | – |
| Some college or more | 88.9% | 76.5% | 71.2% | – |
| Cigarettes per day | 21.1±10.3a | 22.2±6.4 | 20.7±8.5 | 17.5±5.7 |
| Age smoking first (years) | 15.3±2.9 | 14.0±3.4 | 14.8±3.7 | – |
aReported number of cigarettes per day before switching to e-cigarettes